Time reversal mirror as a tool for inversion

Recent time‐reversal mirror (TRM) experiments conducted in the Mediterranean Sea in April 1996 showed that TRM can be used for inverting for the ocean environment [Kuperman et al., J. Acoust. Soc. Am. 103, 25–40 (1998)]. The inversion involves comparing the VRA data resulting from time reversal to the SRA data backpropagated to the VRA in simulation. One natural objective function is the Bartlett power. In this paper, both the Bartlett power objective function and an inversion using an objective function based on the compactness of the backpropagated pulse on the VRA are explored. A global inversion genetic algorithm code will be used along with an efficient broadband normal mode forward propagation model.